Question

In a plant cell,DNA is present in____
A. Only in chromosomes
B. In chromosomes and chloroplasts
C. In chromosomes, chloroplasts and mitochondria
D. In chromosomes, chloroplasts mitochondria and ribosomes

Answer 1

Hint: Plant cells are the basic unit of organisms of the dominion Plantae. Plant cells are eukaryotic cells, they need a true nucleus. The specialized structures present in the cytoplasm are called organelles that perform different functions. They even have a cytomembrane for structural support. The plant cell differs from the animal cell in having a cell wall and chloroplasts.

Complete answer:
DNA stands for Deoxyribonucleic acid. The main role of DNA within the cell is that it is the factor for heredity. It is frequently compared to a blueprint, as it contains the instructions to build other components of the cell, like proteins and RNA molecules. The DNA segments which carry genetic factors are called genes, but other DNA series have structural purposes.

In eukaryotes like animals and plants, DNA is stored inside the nucleus. The nucleus contains chromosomes on which the DNA is present. The DNA present is linear and double stranded. Along with the nucleus, the DNA is present in the mitochondria. Mitochondrial DNA is the tiny circular chromosome found inside mitochondria. These organelles, construct in all eukaryotic cells and they are the powerhouse of the cell.

The plant cell differs from the animal cell in having a chloroplast. These are the sites for photosynthesis. It is found that a single stranded circular DNA is present in the chloroplast which synthesis all the proteins required for photosynthesis. DNA, in plant cells is found within the nucleus, the mitochondria, the chromosome and thus the chloroplasts.

The detailed structure of the plant cell is given below.

Therefore the correct answer is option ‘C’.

Note: In prokaryotes like bacteria and archaea, the DNA is within the cell's cytoplasm. This DNA unlike the eukaryotic DNA is circular and single stranded. The DNA present in the mitochondria and chloroplast are circular and single stranded resembling the prokaryotic type, Like all living organisms, plants use DNA as their genetic material.